Recent developments in oxide ion conductors: focusing on Dion–Jacobson phases

Abstract

Oxide-ion conductors, also known as “oxygen ion conductors,” have garnered significant attention in recent years due to their extensive applications in a variety of electrochemical devices, including oxygen concentrators, solid-oxide...

Hidden chemical order in disordered Ba7Nb4MoO20 revealed by resonant X-ray diffraction and solid-state NMR

“…2a ). We chose Ba 7 Nb 4 MoO 20 ·0.15 H 2 O, because Ba 7 Nb 4 MoO 20 -based oxides and related compounds are emerging materials with high ion conduction, structural disorder and high chemical stability 11 , 34 – 40 . The crystal structures of Ba 7 Nb 4 MoO 20 -based oxides have been extensively investigated.…”

High Proton Conductivity in β‐Ba2ScAlO5 Enabled by Octahedral and Intrinsically Oxygen‐Deficient Layers

“…In dry states, σ tot of α-Ba 2 Sc 0.83 Al 1.17 O 5 is almost independent of P(O 2 ) from 10 −4 to 10 −23 atm at 600 °C and 10 −4 to 10 −20 atm at 800 °C, suggesting that ion conduction is dominant. The slope of log(σ tot ) versus log(P(O 2 )) is positive above 10 −4 atm, with values of 0.252 (9) at 600 °C and 0.225 (12) at 800 °C, indicating p-type conduction. At lower P(O 2 ) below 10 −23 atm at 800 °C, the slope is negative, suggesting n-type electronic conduction.…”

“…To further obtain insights into the OD bonding, future experiments suitable for structural analysis on a local scale should be performed. The refined crystal structure of β-Ba 2 ScAlO 5.152(5) D 0.303 (9) is depicted in Figure 4a. The crystal parameters and reliability factors are summarized in Table S2 (Supporting Information).…”

“…[1][2][3][4][5][6][7][8] Solid oxide fuel cells (SOFCs) using oxide-ion conductors can safely and efficiently generate renewable energy without harmful emissions. [1,[9][10][11][12][13] Because commonly used electrolyte based on yttria-stabilized zirconia operates at relatively high operating temperatures of 700 °C or higher, alternative compounds that exhibit sufficient conductivity at much lower temperatures are required. Reducing the operating temperature is essential for the widespread use of SOFCs, which would extend the service life of the cells and reduce their cost.…”

Multifunctionality of luminescent molecular nanomagnets based on lanthanide complexes

“…[1][2][3][4] Among the desired physical functionalities, one can count, for example, super-ionic conductivity, ferroelectricity, non-linear optical (NLO) effects, luminescence, ferromagnetism and electrochemical activity, and the responsivity of these effects to physical and chemical stimuli. [5][6][7][8][9][10] The combination of at least two of the abovelisted properties in a multifunctional material can be realized in composite systems that are built of functional units, e.g., magnetic nanoparticles covered by luminescent shells. [11][12][13] An alternative is offered by single-phase multifunctional materials whose various physical properties are designed at the molecular level within the homogenous matter.…”